Exception handling with method overriding in java

import java.io.IOException;
 
/**
 * This program is used to show that If 
 * the super class method does not declare
 * an exception then subclass overridden 
 * method cannot declare the checked exception
 * @author w3spoint
 */
 
class SuperClass{
	public void display(){
		System.out.println("Super class.");
	}
}
 
class SubClass extends SuperClass {
	//Compile time error here.
	public void display() throws IOException{
		System.out.println("Sub class.");
	}
}
public class ExceptionHandlingInOverriding1 {
	public static void main(String args[]){
		//Creating subclass object.
		SuperClass obj = new SubClass();
 
		//method call.
		obj.display();
	}
}

Exception in thread "main" java.lang.Error: 
Unresolved compilation problem:  
Exception IOException is not compatible with 
throws clause in SuperClass.display()

/**
 * This program is used to show that 
 * If the super class method does not declare
 * an exception then subclass overridden 
 * method can declare the unchecked exception
 * @author w3spoint
 */
 
class SuperClass{
	public void display(){
		System.out.println("Super class.");
	}
}
 
class SubClass extends SuperClass {
	//No Compile time error here.
	public void display() throws ArithmeticException{
		System.out.println("Sub class.");
	}
}
public class ExceptionHandlingInOverriding2 {
	public static void main(String args[]){
		//Creating subclass object.
		SuperClass obj = new SubClass();
 
		//method call.
		obj.display();
	}
}

Sub class.

/**
 * This program is used to show that 
 * If the super class method declares 
 * an exception then subclass overridden 
 * method can declare same exception.
 * @author w3spoint
 */
 
class SuperClass{
	public void display()throws ArithmeticException{
		System.out.println("Super class.");
	}
}
 
class SubClass extends SuperClass {
	//can declare same exception.
	public void display() throws ArithmeticException{
		System.out.println("Sub class.");
	}
}
 
public class ExceptionHandlingInOverriding3 {
	public static void main(String args[]){
		//Creating subclass object.
		SuperClass obj = new SubClass();
 
		//method call.
		try {
			obj.display();
		} catch (Exception e) {
			System.out.println(e);
		}
	}
}

Sub class.

/**
 * This program is used to show that 
 * If the super class method declares 
 * an exception then subclass overridden 
 * method can declare sub class exception.
 * @author w3spoint
 */
 
class SuperClass{
	public void display()throws Exception{
		System.out.println("Super class.");
	}
}
 
class SubClass extends SuperClass {
	//can declare same exception.
	public void display() throws ArithmeticException{
		System.out.println("Sub class.");
	}
}
 
public class ExceptionHandlingInOverriding4 {
	public static void main(String args[]){
		//Creating subclass object.
		SuperClass obj = new SubClass();
 
		//method call.
		try {
			obj.display();
		} catch (Exception e) {
			System.out.println(e);
		}
	}
}

Sub class.

/**
 * This program is used to show that 
 * If the super class method declares 
 * an exception then subclass overridden 
 * method can declare with no exception.
 * @author w3spoint
 */
 
class SuperClass{
	public void display()throws Exception{
		System.out.println("Super class.");
	}
}
 
class SubClass extends SuperClass {
	//can declare with no exception.
	public void display(){
		System.out.println("Sub class.");
	}
}
 
public class ExceptionHandlingInOverriding5 {
	public static void main(String args[]){
		//Creating subclass object.
		SuperClass obj = new SubClass();
 
		//method call.
		try {
			obj.display();
		} catch (Exception e) {
			System.out.println(e);
		}
	}
}

Sub class.

/**
 * This program is used to show that 
 * If the super class method declares 
 * an exception then subclass overridden 
 * method cannot declare parent exception.
 * @author w3spoint
 */
 
class SuperClass{
	public void display()throws ArithmeticException{
		System.out.println("Super class.");
	}
}
 
class SubClass extends SuperClass {
	//Compile time error here.
	public void display() throws Exception{
		System.out.println("Sub class.");
	}
}
 
public class ExceptionHandlingInOverriding6 {
	public static void main(String args[]){
		//Creating subclass object.
		SuperClass obj = new SubClass();
 
		//method call.
		try {
			obj.display();
		} catch (Exception e) {
			System.out.println(e);
		}
	}
}

Exception in thread "main" java.lang.Error: 
Unresolved compilation problem:
Exception Exception is not compatible with 
throws clause in SuperClass.display()